Paint build-up of flesh, Croce di San Ranierino di Giunta Pisano: Cross-section in visible light, superimposed with details under UV illumination (left) and in the scanning electron microscope (back-scattering electron image, right), [1] Ground layer: gypsum, [2] isolation: presumably animal glue, [3] green base color: green earth, lead white and some blue (lapis lazuli), [4] brownish-green shadow color: green earth, lead white and some red (ochre and cinnabar), [5] ochre flesh tone: yellow and red ochre, cinnabar, some lead white and plant black, [6] varnish